HV8DC - 8 DC port protection

8 DC lines high voltage protection board

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75.02 € (tax incl.)
75.02 €
62.00 € (without tax)
in stock, shipped in 2-3 days

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The lowest price in the 30 last days was 75.02 €

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This is a specially designed board to protect up to 8 DC control wires. The connection between the control box and the equipment outside (on the mast) can be dangerous. During a storm, a potential difference can easily arise or voltage can be induced on the control wires - this voltage needs to be safely routed to a common ground potential to protect the equipment behind the protection.

This protection includes Gas Discharge Tubes (GDT) between the individual control wires and the ground screw and also from the individual wires to the GND terminal. The ground screw is for the common ground-lead connection. Also marked GND on the terminal block is the ground for the equipment and control box. Between these ground points is again a protective GDT. There are two different GNDs - the GND of the control wires and the GND of the screw. The GND screw is for the surge lead to the common ground potential.

Functional description:

The wire from the external environment comes to the terminal and is fed to the high voltage bridge - a thin wire in the function of a fuse. From there it is connected via a capacitor and GDT (75V) to the GND screw. It then goes to the low pass filter and GDT (75V), where it already shares a common GND with the GND terminal on the connector. The low pass filter consists of capacitors and embedded inductance. Behind the LPF is a DC transil with a clamping voltage of about 40V DC, in the opposite way it works as a diode. In parallel with the transil is a LED indicating the voltage on the pin. The input terminal is connected in series with a reset fuse.

This board is unlikely to protect your equipment from being destroyed by a direct lightning strike. Minimising the effects of lightning is a more complex problem and requires a more comprehensive approach.

This board is designed to provide surge suppression and additional protection for indoor equipment. If more energy is discharged, this board may be damaged - shorting out the protection element.


  • DC surge protector
  • Outdoor/indoor HV protection
  • Controller(s) to relays outside

Main functions

  • 8 DC control wires + GND
  • Can be used for more controllers
  • High Voltage protection between wires
  • High Voltage protection to GND wires
  • High Voltage protection to GND screw
  • Current fuse at each pin
  • RFI low pass filter
  • LED indication
  • Screw terminals
  • DIN rail holder (2 pieces)


  • 8 DC control wires
  • Only positive DC voltage
  • DC up to 30V DC
  • Current PTT fuse 0.6A
  • GDT surge protection 75V
  • Transil 40V DC
  • High Voltage bridge fuse
  • RFI low pass filter
  • GDT to GND pin and GND screw
  • LED diodes at each CTRL wire
  • Screw terminal
  • PCB size 135x72 mm

NOTE: For proper operation of the protectors, the grounding screw must be connected to a quality grounding point. The connection must be made with the shortest and thickest wire as possible.

Available as

ASSEMBLED: ready to use

Included in package

HV8DC board assembled and tested
DIN rail holders 2 pieces


If you want to know more please check our wiki with HV8DC manual.

hv8dc protection board assembled version qro.cz hamparts.shop

hv8dc protection board block diagram qro.cz hamparts.shop

hv8dc protection board by qro.cz hamparts.shop

hv8dc protection board by qro.cz hamparts.shop

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Product Details

Data sheet

pcb module
front-end protection
input and output
PCB dimensions
135x72 mm
product weight (brutto)
0.16 kg
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